// JavaScript Document
jQuery
		.extend({

			createUploadIframe : function(id, uri) {
				// create frame
				var frameId = 'jUploadFrame' + id;
				var io;
				if (window.ActiveXObject
						&& (jQuery.browser.version == "6.0"
								|| jQuery.browser.version == "7.0" || jQuery.browser.version == "8.0")) {
					io = document
							.createElement('<iframe id="'
									+ frameId
									+ '" name="'
									+ frameId
									+ '" />');
					if (typeof uri == 'boolean') {
						io.src = 'javascript:false';
					} else if (typeof uri == 'string') {
						io.src = uri;
					}
				} else {
					io = document.createElement('iframe');
					io.id = frameId;
					io.name = frameId;
				}
				io.style.position = 'absolute';
				io.style.top = '-1000px';
				io.style.left = '-1000px';

				document.body.appendChild(io);

				return io;
			},
			createUploadForm : function(id, fileElementId) {
				// create form
				var formId = 'jUploadForm' + id;
				var fileId = 'jUploadFile' + id;
				var form = jQuery('<form  action="" method="POST" name="'
						+ formId
						+ '" id="'
						+ formId
						+ '" enctype="multipart/form-data"></form>');
				var oldElement = jQuery('#' + fileElementId);
				var newElement = jQuery(oldElement).clone();
				jQuery(oldElement).attr('id', fileId);
				jQuery(oldElement).before(newElement);
				jQuery(oldElement).appendTo(form);
				// set attributes
				jQuery(form).css('position', 'absolute');
				jQuery(form).css('top', '-1200px');
				jQuery(form).css('left', '-1200px');
				jQuery(form).appendTo('body');
				return form;
			},

			ajaxFileUpload : function(s) {
				// TODO introduce global settings, allowing the
				// client to modify them for all requests, not
				// only timeout
				s = jQuery.extend({}, jQuery.ajaxSettings, s);
				var id = s.fileElementId;
				var form = jQuery.createUploadForm(id,
						s.fileElementId);
				var io = jQuery.createUploadIframe(id,
						s.secureuri);
				var frameId = 'jUploadFrame' + id;
				var formId = 'jUploadForm' + id;

				if (s.global && !jQuery.active++) {
					// Watch for a new set of requests
					jQuery.event.trigger("ajaxStart");
				}
				var requestDone = false;
				// Create the request object
				var xml = {};
				if (s.global) {
					jQuery.event.trigger("ajaxSend", [ xml,
							s ]);
				}

				var uploadCallback = function(isTimeout) {
					// Wait for a response to come back
					var io = document
							.getElementById(frameId);
					try {
						if (io.contentWindow) {
							xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML
									: null;
							xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument
									: io.contentWindow.document;

						} else if (io.contentDocument) {
							xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML
									: null;
							xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument
									: io.contentDocument.document;
						}
					} catch (e) {
						jQuery.handleError(s, xml,
								null, e);
					}
					if (xml || isTimeout == "timeout") {
						requestDone = true;
						var status;
						try {
							status = isTimeout != "timeout" ? "success"
									: "error";
							// Make sure that the
							// request was
							// successful or
							// notmodified
							if (status != "error") {
								// process the
								// data (runs
								// the xml
								// through
								// httpData
								// regardless of
								// callback)
								var data = jQuery
										.uploadHttpData(
												xml,
												s.dataType);
								if (s.success) {
									// ifa
									// local
									// callback
									// was
									// specified,
									// fire
									// it
									// and
									// pass
									// it
									// the
									// data
									s
											.success(
													data,
													status);
								}
								;
								if (s.global) {
									// Fire
									// the
									// global
									// callback
									jQuery.event
											.trigger(
													"ajaxSuccess",
													[
															xml,
															s ]);
								}
								;
							} else {
								jQuery
										.handleError(
												s,
												xml,
												status);
							}

						} catch (e) {
							status = "error";
							jQuery.handleError(s,
									xml,
									status,
									e);
						}
						;
						if (s.global) {
							// The request was
							// completed
							jQuery.event
									.trigger(
											"ajaxComplete",
											[
													xml,
													s ]);
						}
						;

						// Handle the global AJAX
						// counter
						if (s.global
								&& !--jQuery.active) {
							jQuery.event
									.trigger("ajaxStop");
						}
						;
						if (s.complete) {
							s.complete(xml, status);
						}
						;

						jQuery(io).unbind();

						setTimeout(
								function() {
									try {
										jQuery(
												io)
												.remove();
										jQuery(
												form)
												.remove();

									} catch (e) {
										jQuery
												.handleError(
														s,
														xml,
														null,
														e);
									}

								}, 100);

						xml = null;

					}
					;
				}
				// Timeout checker
				if (s.timeout > 0) {
					setTimeout(
							function() {

								if (!requestDone) {
									// Check
									// to
									// see
									// ifthe
									// request
									// is
									// still
									// happening
									uploadCallback("timeout");
								}

							}, s.timeout);
				}
				try {
					var form = jQuery('#' + formId);
					jQuery(form).attr('action', s.url);
					jQuery(form).attr('method', 'POST');
					jQuery(form).attr('target', frameId);
					if (form.encoding) {
						form.encoding = 'multipart/form-data';
					} else {
						form.enctype = 'multipart/form-data';
					}
					jQuery(form).submit();

				} catch (e) {
					jQuery.handleError(s, xml, null, e);
				}
				if (window.attachEvent) {
					document
							.getElementById(frameId)
							.attachEvent('onload',
									uploadCallback);
				} else {
					document
							.getElementById(frameId)
							.addEventListener(
									'load',
									uploadCallback,
									false);
				}
				return {
					abort : function() {
					}
				};

			},

			uploadHttpData : function(r, type) {
				var data = !type;
				data = type == "xml" || data ? r.responseXML
						: r.responseText;
				// ifthe type is "script", eval it in global
				// context
				if (type == "script") {
					jQuery.globalEval(data);
				}

				// Get the JavaScript object, ifJSON is used.
				if (type == "json") {
					eval("data = " + data);
				}

				// evaluate scripts within html
				if (type == "html") {
					jQuery("<div>").html(data)
							.evalScripts();
				}

				return data;
			}
		});
